Britain's Watson fights back from set down to beat Vandeweghe in gruelling first round match at Mexico Open
Britain's Heather Watson booked her place in the second round of the Mexico Open with a hard-fought victory over American Coco Vandeweghe.
The 27 year-old battled back from a set down to win 4-6 6-4 6-4 in two hours and 33 minutes.
In a topsy-turvy opening set, Vandeweghe turned things around from a break down to dampen British hopes.
But Watson showed resolve as she claimed the only break early on in the second set to force the match to a decider.
And a double break secured the win for Watson in what was a marathon last set that lasted more than an hour.
After the match, the Brit said: "I was just pleased with how well I fought. I wasn't playing my best, but I stuck in there. I'm just really enjoying my tennis.
"I didn't feel like I had much rest. From the Australian Open, I had a week at home, but then I went straight to Fed Cup and was there the whole week.
"Fed Cup is a very high-stress environment, and I feel like I'm just about recovered to be here now."
Watson will now face Ukrainian Kateryna Bondarenko for a place in the quarter-finals in Mexico.